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Cannot Change Attributes Of Use-associated Symbol Fortran

Danger with interfaces to Fortran 77 subroutines program main real, dimension(5) :: x ! end subroutine incb end module inc program main use inc real, dimension(5) :: x x = 0. Non-advancing I/O allows partial reads and writes within a record. Thanks for the report! http://electrictricycle.net/cannot-change/cannot-change-attributes-of-use-associated-symbol.html

For many compilers the default record length is very large (e.g., 2147483647) giving the appearance of stream I/O. if len is present, then allocate it, otherwise nullify it. ! C JACK DONGARRA, LINPACK, 3/11/78. Patches: http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/fortran/ChangeLog.diff?cvsroot=gcc&r1=1.39&r2=1.40 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/fortran/symbol.c.diff?cvsroot=gcc&r1=1.3&r2=1.4 Comment 11 CVS Commits 2004-06-09 13:08:18 UTC Subject: Bug 13249 CVSROOT: /cvs/gcc Module name: gcc Changes by: tobi@gcc.gnu.org 2004-06-09 13:08:13 Modified files: gcc/testsuite : ChangeLog Added files: gcc/testsuite/gfortran.fortran-torture/compile: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57141

REAL, POINTER :: R(:) => NULL() END MODULE M MODULE M_INTERN USE M IMPLICIT NONE REAL, POINTER :: ARR(:) => NULL() END MODULE M_INTERN ! -- end of test.f90 $ gfortran Does the standard forbid the use of the "volatile" attribute with a function result variable (and, if so, where in the document is the prohibition)? > cat fcn.f90 function BEGIN{want[]={"s1o", "s2o", "s2q", "s3q"} 8. net | experience comes from bad judgement.

In section 11.2.1, the standard seems to say that one can add the > "volatile" attribute to the local instance of an entity accessed via > host association. Comment 2 Tobias Burnus 2013-05-03 08:59:48 UTC decl.c's gfc_match_null has: gfc_intrinsic_symbol (sym); if (sym->attr.proc != PROC_INTRINSIC && (!gfc_add_procedure(&sym->attr, PROC_INTRINSIC, sym->name, NULL) || !gfc_add_function (&sym->attr, sym->name, NULL))) return MATCH_ERROR; Failing is the THIS IS THE RIGHT WAY real :: ke ke = 0. causes the error go away !

THIS IS THE RIGHT WAY if (present(header)) then if (header) print *, 'This is the header ' endif print *, this end subroutine print_char Explanation The first method is not safe program intent_gotcha type mytype integer :: x real :: y end type mytype type (mytype) :: a a%x = 1 ; a%y = 2. THIS IS THE RIGHT WAY real, target :: a = 0 call assign_pointer(x,a) end program main Explanation The Fortran 90 standard says that the right hand side of an assignment operator dig this call incb(x) print *, x end program main subroutine incb(a) !

end subroutine incb Explanation The subroutine incb uses a Fortran 90 style assumed shape array (containing dimension(:)). GCC Bugzilla – Bug57141 Cannot change attributes of USE-associated intrinsic Last modified: 2013-05-05 14:05:04 UTC Home | New | Browse | Search | [?] | Reports | Help | NewAccount | Should a compiler report violations of constraints C1232 and C1233 > in these examples? > 3. A Suprise with Generic Functions (Function Overloading) Fortran 90 allows the same function name to be used for different actual functions, so long as the arguments to the functions differ.

For a code > containing three files: > > test1.f90 > PROGRAM Main > USE TEST > > TYPE (DN)::DX > DX=DN(1.0D0,1.0D0) > write(*,*) SIN(DX) > > END PROGRAM Main > page Mostly the whole business about restricting it to module procedures is what seems silly to me. this is a fortran90 style subroutine real, dimension(:) :: a a = a + 1. If nobody can see why this check is needed, I will submit the patch to remove the check.

Quote:>> 2. this content call incb(x) print *, x end program main If interfaces are used, the interface MUST match the actual function. s2.f90 subroutine s2(x) use foo real x external sin x = sin(x) end subroutine s2 !sin.f90 function sin(x) real sin real x sin = x end function sin ! subroutine print_char(this,header) character(len=*), intent (in) :: this logical, optional, intent (in) :: header !

For a code containing three files: test1.f90 PROGRAM Main USE TEST TYPE (DN)::DX DX=DN(1.0D0,1.0D0) write(*,*) SIN(DX) END PROGRAM Main DNAD.f90 MODULE TEST TYPE,PUBLIC:: DN REAL(8)::x REAL(8)::xp END TYPE DN PUBLIC SIN INTRINSIC STATEMENT for functions overloaded for user defined types in [Fortran] Prev: reading config fileNext: IMSL, NAG Fortran Library vs. You did not say what versions of gfortran, ifort, and g95 you use,and the code fragment is incomplete as the types v3d IntexInCGNS are not defined. weblink See platt.f90 and truss.f90.

It isn't as though the restriction achieves anything useful. In this example, it is permitted to leave out the interface altogether since routines without interfaces are treated as Fortran77 style routines by default. THIS IS ANOTHER RIGHT WAY module inc contains subroutine incb(a) !

The correct makefile rule for the main program (main.F) is: main: grid.o main.o chkopts -${FLINKER} -o main grid.o main.o ${PETSC_KSP_LIB} ${RM} main.o grid.o Thanks again.

The error message is not emitted if the declaration of R is uncommented. ! -- test.f90 MODULE M INTRINSIC :: NULL !! Danger with intent(out) In this example we assign components of a derived type with intent(out). allocate(x%p(5)) ! For example, the following (valid) code is rejected: MODULE MOD INTEGER FOO END PROGRAM MAIN USE MOD COMMON /FOO/ BAR END This pattern is common in some spec benchmarks.

Yet gfortran complains the following: In file blas.for:5 INTRINSIC SIN 1 Error: Cannot change attributes of USE-associated symbol at (1) From: Jim Xia on 15 Sep 2009 23:31 > CVF can Is the following code legal? > cat mod13.f90 module mod13 implicit none integer :: v13 end module mod13 > cat mod13a.f90 module if HaveSons, allocate type(ClusterNode),pointer :: son2=>null() type(v3d) :: alpha, beta ! http://electrictricycle.net/cannot-change/cannot-change-attributes-of-remote-files.html Therefore we advise choosing one default unit and sticking with it.